Update, 1:30 p.m. EDT: The U.K.'s Telegraph is reporting that passengers are revolting at the fact Artemis missed a number of ports of call and that a P&O customer service staff member had been flown out to join the ship.

(May 7, 3:30 p.m. EDT) -- Engine troubles have forced P&O's Artemis to sail at a reduced speed for the entirety of its current 20-night cruise, resulting in itinerary changes.

According to earlier reports by Southampton's Daily Echo, the cruise line informed passengers before embarkation that they would not be able to make the scheduled stop in Valencia and that they would each receive £150 in onboard credit. It was only after the cruise began that the technical issues prompted additional itinerary changes.

According to a statement from the cruise line, to compensate for the additional change in plans, P&O Cruises is upping the reparation amount to £300 in onboard credit per passenger, each of whom will also receive a £200 check after returning home.

The statement further confirms that there are no safety risks related to the reduction in speed and that a team of engineers is working onboard to resolve the issue.

The current sailing returns to Southampton on May 16 and, later that day, the ship will depart for a 14-night Baltic cruise; at this point, it's expected to sail as scheduled. We'll keep you posted.